package com.ternnetwork.commons.utils;


import java.security.*;
import java.security.cert.*;
import java.io.*;

import javax.net.ssl.*;

/**
 * 导入批定网站的证书到本地java证书库
 * @author xuwenfeng
 *
 */
public class InstallCert {
	
	public static void main(String[] args) throws Exception {
		
		args= new String[]{""};
		String host;
		int port;
		char[] passphrase;
		
		args[0] = "oss.sonatype.org";
		
		if ((args.length == 1) || (args.length == 2)) {
		    String[] c = args[0].split(":");
		    host = c[0];
		    port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
		    String p = (args.length == 1) ? "changeit" : args[1];
		    passphrase = p.toCharArray();
		} else {
		    System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");
		    return;
		}

		File file = new File("jssecacerts");
		if (file.isFile() == false) {
		    char SEP = File.separatorChar;
		    File dir = new File(System.getProperty("java.home") + SEP
			    + "lib" + SEP + "security");
		    file = new File(dir, "jssecacerts");
		    if (file.isFile() == false) {
			file = new File(dir, "cacerts");
		    }
		}
		System.out.println("Loading KeyStore " + file + "...");
		InputStream in = new FileInputStream(file);
		KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
		ks.load(in, passphrase);
		in.close();

		SSLContext context = SSLContext.getInstance("TLS");
		TrustManagerFactory tmf =
		    TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
		tmf.init(ks);
		X509TrustManager defaultTrustManager = (X509TrustManager)tmf.getTrustManagers()[0];
		SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
		context.init(null, new TrustManager[] {tm}, null);
		SSLSocketFactory factory = context.getSocketFactory();

		System.out.println("Opening connection to " + host + ":" + port + "...");
		SSLSocket socket = (SSLSocket)factory.createSocket(host, port);
		socket.setSoTimeout(10000);
		try {
		    System.out.println("Starting SSL handshake...");
		    socket.startHandshake();
		    socket.close();
		    System.out.println();
		    System.out.println("No errors, certificate is already trusted");
		} catch (SSLException e) {
		    System.out.println();
		    e.printStackTrace(System.out);
		}

		X509Certificate[] chain = tm.chain;
		if (chain == null) {
		    System.out.println("Could not obtain server certificate chain");
		    return;
		}

		BufferedReader reader =
			new BufferedReader(new InputStreamReader(System.in));

		System.out.println();
		System.out.println("Server sent " + chain.length + " certificate(s):");
		System.out.println();
		MessageDigest sha1 = MessageDigest.getInstance("SHA1");
		MessageDigest md5 = MessageDigest.getInstance("MD5");
		for (int i = 0; i < chain.length; i++) {
		    X509Certificate cert = chain[i];
		    System.out.println
		    	(" " + (i + 1) + " Subject " + cert.getSubjectDN());
		    System.out.println("   Issuer  " + cert.getIssuerDN());
		    sha1.update(cert.getEncoded());
		    System.out.println("   sha1    " + toHexString(sha1.digest()));
		    md5.update(cert.getEncoded());
		    System.out.println("   md5     " + toHexString(md5.digest()));
		    System.out.println();
		}

		System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
		String line = reader.readLine().trim();
		int k;
		try {
		    k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
		} catch (NumberFormatException e) {
		    System.out.println("KeyStore not changed");
		    return;
		}

		X509Certificate cert = chain[k];
		String alias = host + "-" + (k + 1);
		ks.setCertificateEntry(alias, cert);

		OutputStream out = new FileOutputStream("jssecacerts");
		ks.store(out, passphrase);
		out.close();

		System.out.println();
		System.out.println(cert);
		System.out.println();
		System.out.println
			("Added certificate to keystore 'jssecacerts' using alias '"
			+ alias + "'");
	    }

	    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

	    private static String toHexString(byte[] bytes) {
		StringBuilder sb = new StringBuilder(bytes.length * 3);
		for (int b : bytes) {
		    b &= 0xff;
		    sb.append(HEXDIGITS[b >> 4]);
		    sb.append(HEXDIGITS[b & 15]);
		    sb.append(' ');
		}
		return sb.toString();
	    }

	    private static class SavingTrustManager implements X509TrustManager {

		private final X509TrustManager tm;
		private X509Certificate[] chain;

		SavingTrustManager(X509TrustManager tm) {
		    this.tm = tm;
		}

		public X509Certificate[] getAcceptedIssuers() {
		    throw new UnsupportedOperationException();
		}

		public void checkClientTrusted(X509Certificate[] chain, String authType)
			throws CertificateException {
		    throw new UnsupportedOperationException();
		}

		public void checkServerTrusted(X509Certificate[] chain, String authType)
			throws CertificateException {
		    this.chain = chain;
		    tm.checkServerTrusted(chain, authType);
		}
	    }
}
